Company lists · Data refreshed September 2026

Top 25 Email security companies based in the United States

Name: Email security companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 1, 2026 82 companies tracked

RevenueBase identified 82 email security companies headquartered in the United States as of September 2026 and tracks 1,644 professional contacts across them, including 417 with verified work emails and 519 with mobile numbers. Atlanta is the largest hub.

This list covers email security companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 1, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase Smart Search rating on every row Refreshed Sep 1, 2026 86% judged on-target in blind review

82Companies

1,644Contacts tracked

417Verified emails

519Mobile numbers

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The 25 largest email security companies based in the United States

Ranked by team size

Top 25 of 82 email security companies based in the United States, ranked by team size, largest first. Data refreshed Sep 1, 2026. RevenueBase Smart Search rates how each company's information relates to email security companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Sublime Security	Strong evidence	Washington, DC, United States	201-500	237 contacts →
	Strong evidence “Sublime is the new standard for email security.” Source: RevenueBase Database · checked Sep 1, 2026
2	ZIX	Strong evidence	Dallas, TX, United States	501-1,000	200 contacts →
	Strong evidence “Zix, an OpenText company, is a leader in email security and helps organizations overcome their greatest digital transformation challenges by providing a secure, modern workplace.” Source: RevenueBase Database · checked Sep 1, 2026
3	Ironscales	Strong evidence	Atlanta, GA, United States	51-200	165 contacts →
	Strong evidence “IRONSCALES is the leader in AI-powered email security protecting over global organizations from advanced phishing threats.” Source: RevenueBase Database · checked Sep 1, 2026
4	ESOFT	Partial evidence	Broomfield, CO, United States	51-200	140 contacts →
	Partial evidence “eSoft is a leader in providing Simply Better Network Security™ to businesses of nearly any size.” Source: RevenueBase Database · checked Sep 1, 2026
5	Powerdmarc	Partial evidence	Middletown, DE, United States	51-200	43 contacts →
	Partial evidence “PowerDMARC empowers organizations to combat Business Email Compromise (BEC), email spoofing, and phishing with ease.” Source: RevenueBase Database · checked Sep 1, 2026
6	Mailprotector	Strong evidence	Greenville, SC, United States	11-50	42 contacts →
	Strong evidence “Mailprotector has built email security for the MSP channel for over 25 years on a fundamentally different premise: remove the conditions that create problems rather than defend…” Source: RevenueBase Database · checked Sep 1, 2026
7	Perception Point	Indirect evidence	Boston, MA, United States	51-200	36 contacts →
	Indirect evidence “Perception Point is a leading provider of AI-powered threat prevention solutions that safeguard the modern workspace against sophisticated threats.” Source: RevenueBase Database · checked Sep 1, 2026
8	Abusix, INC	Strong evidence	Boston, MA, United States	11-50	32 contacts →
	Strong evidence “At Abusix, we empower businesses, ISPs, and email service providers with cutting-edge security solutions to safeguard digital infrastructure.” Source: RevenueBase Database · checked Sep 1, 2026
9	Abnormal Security	Partial evidence	San Francisco, CA, United States	501-1,000	26 contacts →
	Partial evidence “Abnormal provides total protection against the widest range of email attacks including phishing, malware, ransomware, social engineering, executive impersonation, supply chain…” Source: RevenueBase Database · checked Sep 1, 2026
10	Cloudflare Area 1 Security	Strong evidence	San Francisco, CA, United States	51-200	23 contacts →
	Strong evidence “Cloudflare Area 1 is a cloud-native email security service that identifies and blocks attacks before they hit user inboxes, enabling more effective protection against spear…” Source: RevenueBase Database · checked Sep 1, 2026
11	Sendio Technologies, INC	Partial evidence	Newport Beach, CA, United States	11-50	19 contacts →
	Partial evidence “Founded in 2003, Sendio is a venture-backed, privately held company whose products protect the email environments of enterprises and institutions from attacks and abuse, and…” Source: RevenueBase Database · checked Sep 1, 2026
12	Safeguard Cyber	Strong evidence	Charlottesville, VA, United States	51-200	18 contacts →
	Strong evidence “SafeGuard Cyber provides security and compliance for email and multi-channel communications.” Source: RevenueBase Database · checked Sep 1, 2026
13	Mailgate	Strong evidence	Greenwood, IN, United States	11-50	16 contacts →
	Strong evidence “MailGate SC is a comprehensive email security solution that protects your organization from a wide range of advanced threats.” Source: RevenueBase Database · checked Sep 1, 2026
14	Spambrella	Strong evidence	Dover, DE, United States	51-200	15 contacts →
	Strong evidence “Spambrella is a Worldwide email content control security ‘software as a service’ (SaaS) provider.” Source: RevenueBase Database · checked Sep 1, 2026
15	Edgewave	Strong evidence	La Jolla, CA, United States	51-200	15 contacts →
	Strong evidence “EdgeWave is hyper-focused on delivering the World’s Safest Inboxes™ by eliminating email-borne security risks for organizations in the face of targeted, socially engineered…” Source: RevenueBase Database · checked Sep 1, 2026
16	AGARI	Partial evidence	Foster City, CA, United States	51-200	14 contacts →
	Partial evidence “Agari is the Trusted Email Identity Company™, protecting brands and people from devastating phishing and socially-engineered attacks.” Source: RevenueBase Database · checked Sep 1, 2026
17	Maysoft	Indirect evidence	Santa Barbara, CA, United States	11-50	14 contacts →
	Indirect evidence “Maysoft has been stopping spam and viruses for over 10 years.” Source: RevenueBase Database · checked Sep 1, 2026
18	Duocircle	Partial evidence	San Diego, CA, United States	11-50	13 contacts →
	Partial evidence “Reliable and Secure email hosting services for SMB and Enterprise.” Source: RevenueBase Database · checked Sep 1, 2026
19	BLOXX	Partial evidence	Newton, MA, United States	51-200	13 contacts →
	Partial evidence “Established in Bloxx is a true pioneer in the development and support of sophisticated Email and Web filtering technology.” Source: RevenueBase Database · checked Sep 1, 2026
20	inquest.net	Partial evidence	Austin, TX, United States	11-50	12 contacts →
	Partial evidence “At InQuest, we specialize in providing comprehensive network-based security solutions that empower organizations to protect their most critical assets: their people.” Source: RevenueBase Database · checked Sep 1, 2026
21	Greathorn	Partial evidence	Waltham, MA, United States	11-50	10 contacts →
	Partial evidence “Global companies use GreatHorn to reduce the inherent and pervasive risk associated with the everyday use of email.” Source: RevenueBase Database · checked Sep 1, 2026
22	Ravenmail	Indirect evidence	Dallas, TX, United States	11-50	10 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 1, 2026
23	Identillect Technologies INC	Partial evidence	Poway, CA, United States	11-50	10 contacts →
	Partial evidence “At Identillect Technologies, we create a user-friendly secure email solution to protect critical information, with an emphasis on simplicity.” Source: RevenueBase Database · checked Sep 1, 2026
24	ISP Cloud Services INC	Indirect evidence	Miami, FL, United States	1-10	7 contacts →
	Indirect evidence “Down-to earth Cloud services.” Source: RevenueBase Database · checked Sep 1, 2026
25	Criptext	Partial evidence	New York, NY, United States	1-10	6 contacts →
	Partial evidence “Criptext provides secure email and messaging for governments and large enterprises.” Source: RevenueBase Database · checked Sep 1, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: email security companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names email security companies.
Partial evidence: Its own public description names part of email security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name email security companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 82 email security companies based in the United States

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Email security companies based in the United States at a glance

As of Sep 1, 2026

25.4%Verified-email coverage

31.6%Mobile-number coverage

20.0Average contacts per company

11-50Median size (employees)

4.9%Largest-city concentration · Atlanta

Sep 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among email security companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “email security companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names email security companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among email security companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 417 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 1, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names email security companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many email security companies are there based in the United States?

RevenueBase identified 82 email security companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Sublime Security, headquartered in Washington, tops this list with the largest team on record.

Which city has the most email security companies?

Atlanta leads with 4 headquartered companies, followed by Boston (4) and New York (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 417 verified decision-maker contacts tracked across these 82 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 1, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.